Identification of geographic runoff sources in a data sparse region: hydrological processes and the limitations of tracer‐based approaches
Identification of geographic runoff sources in a data sparse region: hydrological processes and the limitations of tracer‐based approaches
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DOI：
10.1002/hyp.7678
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发表时间：
2010-07
影响因子：
3.2
通讯作者：
F. Barthold;Jin-kui Wu;K. Vaché;K. Schneider;H. Frede;L. Breuer
中科院分区：
文献类型：
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作者：
F. Barthold;Jin-kui Wu;K. Vaché;K. Schneider;H. Frede;L. Breuer
有一个日益增长的需要，以提高我们的理解更大尺度上的集水过程。在中国等迅速发展的国家，这种需要尤其突出，因为传统使用的土地被转移到城市化和工业化地区，影响到水资源。在这项研究中，我们选择了一个多示踪剂的方法，在内蒙古的一个大的，无资料的流域，以阐明过程，产生河流流量。我们应用端元混合分析（EMMA），以确定和量化的三个端元系统中的主要产流源。溪水和一组八个可能的端元采样在整个三个连续的植被期。采用电感耦合等离子体质谱法（ICP-MS）和离子色谱法（IC）分析样品中的33种溶质，包括24种阳离子和7种阴离子。我们确定了七种示踪剂表现出保守行为，它们是Li，Rb，Sr，Na，Mg，Cl和电导率（EC）。稳定的水同位素（δD和δ 18 O）突出了端元之间的差异。我们的研究结果表明，强烈的年际变化的端员组成和3年之间的贡献。我们能够确定浅层地下水含水层作为重要的径流产生源，在某些年份和更深的地下水含水层在其他年份的降雨量和排放量不同。覆盖该地区很大一部分的浅沙丘含水层在储存和向河流供水方面发挥着重要作用。我们的研究结果还表明，在干旱年的主要产流源尚未确定。我们的研究结果促使我们把未来的工作重点放在了解端元贡献的年际变化上，特别是在半干旱地区。版权所有© 2010约翰威利父子有限公司.
There exists a growing need to improve our understanding of catchment processes on larger scales. This need is especially enhanced in rapidly developing countries such as China where the turnover of traditionally used land to urbanized and industrialized areas influences water resources. In this study, we chose a multi‐tracer approach in a large, ungauged basin in Inner Mongolia to elucidate the processes that generate stream flow. We applied end member mixing analysis (EMMA) to identify and quantify the major runoff generating sources in a three end member system. Stream water and a set of eight possible end members were sampled throughout three consecutive vegetation periods. Samples were analysed with an inductively coupled plasma‐mass spectrometry (ICP‐MS) and an ion chromatograph (IC) for a suite of 33 solutes including 24 cations and 7 anions. We determined that seven tracers exhibited conservative behaviour, they were Li, Rb, Sr, Na, Mg, Cl and electrical conductivity (EC). Stable water isotopes (δD and δ18O) highlight differences between the end members. Our results indicate strong interannual variability of end member composition and contribution between the 3 years. We were able to identify shallow groundwater aquifers as important runoff generating sources in some years and deeper groundwater aquifers in other years which vary in rainfall and discharge. A shallow sand dune aquifer which covers a significant part of the area plays an important role in storing and contributing water to the river. Our results also suggest that the major runoff generating source in the dryer year has not been identified yet. Our results prompt us to focus future work on understanding interannual changes in end member contribution especially in semi‐arid regions. Copyright © 2010 John Wiley & Sons, Ltd.